Add the ability to specify a robots.txt file, with a default disallowing the download links

README.md

@@ -60,6 +60,7 @@ Certain values can be set via environment variables, using the `-e` parameter on
 * __DEFAULT_OPTION_PLAYLIST_ITEM_LIMIT__: Maximum numer of playlist items that can be downloaded. Defaults to `0` (no limit).
 * __YTDL_OPTIONS__: Additional options to pass to youtube-dl, in JSON format. [See available options here](https://github.com/yt-dlp/yt-dlp/blob/master/yt_dlp/YoutubeDL.py#L183). They roughly correspond to command-line options, though some do not have exact equivalents here, for example `--recode-video` has to be specified via `postprocessors`. Also note that dashes are replaced with underscores.
 * __YTDL_OPTIONS_FILE__: A path to a JSON file that will be loaded and used for populating `YTDL_OPTIONS` above. Please note that if both `YTDL_OPTIONS_FILE` and `YTDL_OPTIONS` are specified, the options in `YTDL_OPTIONS` take precedence.
+* __ROBOTS_TXT__: A path to a `robots.txt` file mounted in the container
 
 The following example value for `YTDL_OPTIONS` embeds English subtitles and chapter markers (for videos that have them), and also changes the permissions on the downloaded video and sets the file modification timestamp to the date of when it was downloaded:
 

app/main.py

@@ -35,6 +35,7 @@ class Config:
         'DEFAULT_OPTION_PLAYLIST_ITEM_LIMIT' : '0',
         'YTDL_OPTIONS': '{}',
         'YTDL_OPTIONS_FILE': '',
+        'ROBOTS_TXT': '',
         'HOST': '0.0.0.0',
         'PORT': '8081',
         'HTTPS': 'false',
@@ -218,6 +219,16 @@ def index(request):
         response.set_cookie('metube_theme', config.DEFAULT_THEME)
     return response
 
+@routes.get(config.URL_PREFIX + 'robots.txt')
+def robots(request):
+    if config.ROBOTS_TXT:
+        response = web.FileResponse(os.path.join(config.BASE_DIR, config.ROBOTS_TXT))
+    else:
+        response = web.Response(
+            text="User-agent: *\nDisallow: /download/\nDisallow: /audio_download/\n"
+        )
+    return response
+
 if config.URL_PREFIX != '/':
     @routes.get('/')
     def index_redirect_root(request):